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  <span><svg xmlns="http://www.w3.org/2000/svg" aria-hidden="true" focusable="false" x="0px" y="0px" viewBox="0 0 100 100" width="15" height="15" class="icon outbound"><path fill="currentColor" d="M18.8,85.1h56l0,0c2.2,0,4-1.8,4-4v-32h-8v28h-48v-48h28v-8h-32l0,0c-2.2,0-4,1.8-4,4v56C14.8,83.3,16.6,85.1,18.8,85.1z"></path> <polygon fill="currentColor" points="45.7,48.7 51.3,54.3 77.2,28.5 77.2,37.2 85.2,37.2 85.2,14.9 62.8,14.9 62.8,22.9 71.5,22.9"></polygon></svg> <span class="sr-only">(opens new window)</span></span></a></li></ul></div></div> <!----></nav> <ul class="sidebar-links"><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading open"><span>Java Script</span> <span class="arrow down"></span></p> <ul class="sidebar-links sidebar-group-items"><li><a href="/my-blog/blogs/JavaScript/01.html" class="sidebar-link">JavaScript基础</a></li><li><a href="/my-blog/blogs/JavaScript/02.html" class="sidebar-link">JavaScript基础—运算符</a></li><li><a href="/my-blog/blogs/JavaScript/03.html" class="sidebar-link">JavaScript基础—流程控制</a></li><li><a href="/my-blog/blogs/JavaScript/04.html" aria-current="page" class="active sidebar-link">/blogs/JavaScript/04.html</a></li><li><a href="/my-blog/blogs/JavaScript/05.html" class="sidebar-link">JavaScript基础—数组</a></li><li><a href="/my-blog/blogs/JavaScript/06.html" class="sidebar-link">JavaScript基础—函数</a></li><li><a href="/my-blog/blogs/JavaScript/07.html" class="sidebar-link">JavaScript基础—作用域</a></li><li><a href="/my-blog/blogs/JavaScript/08.html" class="sidebar-link">JavaScript基础—对象</a></li><li><a href="/my-blog/blogs/JavaScript/es-1.html" class="sidebar-link">面向过程与面向对象</a></li><li><a href="/my-blog/blogs/JavaScript/es-2.html" class="sidebar-link">构造函数和原型</a></li><li><a href="/my-blog/blogs/JavaScript/es-3.html" class="sidebar-link">函数的定义和调用</a></li><li><a href="/my-blog/blogs/JavaScript/es-4.html" class="sidebar-link">正则表达式概述</a></li><li><a href="/my-blog/blogs/JavaScript/es-5.html" class="sidebar-link">ES6相关概念</a></li></ul></section></li></ul> </aside> <div class="password-shadow password-wrapper-in" style="display:none;" data-v-4e82dffc data-v-1156296a><h3 class="title" data-v-4e82dffc data-v-4e82dffc></h3> <!----> <label id="box" class="inputBox" data-v-4e82dffc data-v-4e82dffc><input type="password" value="" data-v-4e82dffc> <span data-v-4e82dffc>Konck! Knock!</span> <button data-v-4e82dffc>OK</button></label> <div class="footer" data-v-4e82dffc data-v-4e82dffc><span data-v-4e82dffc><i class="iconfont reco-theme" data-v-4e82dffc></i> <a target="blank" href="https://vuepress-theme-reco.recoluan.com" data-v-4e82dffc>vuePress-theme-reco</a></span> <span data-v-4e82dffc><i class="iconfont reco-copyright" data-v-4e82dffc></i> <a data-v-4e82dffc><span data-v-4e82dffc>Justic</span>
            
          <span data-v-4e82dffc>2019 - </span>
          2021
        </a></span></div></div> <div data-v-1156296a><main class="page"><section><div class="page-title"><h1 class="title"></h1> <div data-v-1ff7123e><i class="iconfont reco-account" data-v-1ff7123e><span data-v-1ff7123e>Justic</span></i> <!----> <i class="iconfont reco-eye" data-v-1ff7123e><span id="/my-blog/blogs/JavaScript/04.html" data-flag-title="Your Article Title" class="leancloud-visitors" data-v-1ff7123e><a class="leancloud-visitors-count" style="font-size:.9rem;font-weight:normal;color:#999;"></a></span></i> <!----></div></div> <div class="theme-reco-content content__default"> sources --&gt;找到需要调试的文件--&gt;在程序的某一行设置断点
<p>2、Watch: 监视，通过watch可以监视变量的值的变化，非常的常用。
3、摁下F11，程序单步执行，让程序一行一行的执行，这个时候，观察watch中变量的值的变化。
复制代码</p> <div class="language- line-numbers-mode"><pre class="language-text"><code>
- for 循环重复相同的代码

  比如输出10句“媳妇我错了”

  ```js
  //  基本写法
  for(var i = 1; i &lt;= 10; i++){
      console.log('媳妇我错了~');
  }
  // 用户输入次数
  var num = prompt('请输入次数:')；
  for ( var i = 1 ; i &lt;= num; i++) {
      console.log('媳妇我错了~');
  } 
  复制代码
</code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br><span class="line-number">5</span><br><span class="line-number">6</span><br><span class="line-number">7</span><br><span class="line-number">8</span><br><span class="line-number">9</span><br><span class="line-number">10</span><br><span class="line-number">11</span><br><span class="line-number">12</span><br><span class="line-number">13</span><br><span class="line-number">14</span><br><span class="line-number">15</span><br><span class="line-number">16</span><br></div></div><ul><li><p>for 循环重复不相同的代码</p> <p>例如，求输出1到100岁：</p> <div class="language-js line-numbers-mode"><pre class="language-js"><code><span class="token comment">//  基本写法</span>
<span class="token keyword">for</span> <span class="token punctuation">(</span><span class="token keyword">var</span> i <span class="token operator">=</span> <span class="token number">1</span><span class="token punctuation">;</span> i <span class="token operator">&lt;=</span> <span class="token number">100</span><span class="token punctuation">;</span> i<span class="token operator">++</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
      console<span class="token punctuation">.</span><span class="token function">log</span><span class="token punctuation">(</span><span class="token string">'这个人今年'</span> <span class="token operator">+</span> i <span class="token operator">+</span> <span class="token string">'岁了'</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span>
复制代码
</code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br><span class="line-number">5</span><br></div></div><p>例如，求输出1到100岁，并提示出生、死亡</p> <div class="language-js line-numbers-mode"><pre class="language-js"><code><span class="token comment">// for 里面是可以添加其他语句的 </span>
<span class="token keyword">for</span> <span class="token punctuation">(</span><span class="token keyword">var</span> i <span class="token operator">=</span> <span class="token number">1</span><span class="token punctuation">;</span> i <span class="token operator">&lt;=</span> <span class="token number">100</span><span class="token punctuation">;</span> i<span class="token operator">++</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
 <span class="token keyword">if</span> <span class="token punctuation">(</span>i <span class="token operator">==</span> <span class="token number">1</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
    console<span class="token punctuation">.</span><span class="token function">log</span><span class="token punctuation">(</span><span class="token string">'这个人今年1岁了， 它出生了'</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
 <span class="token punctuation">}</span> <span class="token keyword">else</span> <span class="token keyword">if</span> <span class="token punctuation">(</span>i <span class="token operator">==</span> <span class="token number">100</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
    console<span class="token punctuation">.</span><span class="token function">log</span><span class="token punctuation">(</span><span class="token string">'这个人今年100岁了，它死了'</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
  <span class="token punctuation">}</span> <span class="token keyword">else</span> <span class="token punctuation">{</span>
       console<span class="token punctuation">.</span><span class="token function">log</span><span class="token punctuation">(</span><span class="token string">'这个人今年'</span> <span class="token operator">+</span> i <span class="token operator">+</span> <span class="token string">'岁了'</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
  <span class="token punctuation">}</span>
<span class="token punctuation">}</span>
复制代码
</code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br><span class="line-number">5</span><br><span class="line-number">6</span><br><span class="line-number">7</span><br><span class="line-number">8</span><br><span class="line-number">9</span><br><span class="line-number">10</span><br><span class="line-number">11</span><br></div></div><p>for循环因为有了计数器的存在，还可以重复的执行某些操作，比如做一些算术运算。</p></li></ul> <h3 id="_1-2-双重for循环"><a href="#_1-2-双重for循环" class="header-anchor">#</a> 1.2 双重for循环</h3> <ul><li><p>双重 for 循环概述</p> <p>循环嵌套是指在一个循环语句中再定义一个循环语句的语法结构，例如在for循环语句中，可以再嵌套一个for 循环，这样的 for 循环语句我们称之为双重for循环。</p></li> <li><p>双重 for 循环语法</p> <div class="language-js line-numbers-mode"><pre class="language-js"><code><span class="token keyword">for</span> <span class="token punctuation">(</span>外循环的初始<span class="token punctuation">;</span> 外循环的条件<span class="token punctuation">;</span> 外循环的操作表达式<span class="token punctuation">)</span> <span class="token punctuation">{</span>
    <span class="token keyword">for</span> <span class="token punctuation">(</span>内循环的初始<span class="token punctuation">;</span> 内循环的条件<span class="token punctuation">;</span> 内循环的操作表达式<span class="token punctuation">)</span> <span class="token punctuation">{</span>  
       需执行的代码<span class="token punctuation">;</span>
   <span class="token punctuation">}</span>
<span class="token punctuation">}</span>
复制代码
</code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br><span class="line-number">5</span><br><span class="line-number">6</span><br></div></div><ul><li>内层循环可以看做外层循环的循环体语句</li> <li>内层循环执行的顺序也要遵循 for 循环的执行顺序</li> <li>外层循环执行一次，内层循环要执行全部次数</li></ul></li> <li><p>打印五行五列星星</p> <div class="language-js line-numbers-mode"><pre class="language-js"><code><span class="token keyword">var</span> star <span class="token operator">=</span> <span class="token string">''</span><span class="token punctuation">;</span>
<span class="token keyword">for</span> <span class="token punctuation">(</span><span class="token keyword">var</span> j <span class="token operator">=</span> <span class="token number">1</span><span class="token punctuation">;</span> j <span class="token operator">&lt;=</span> <span class="token number">3</span><span class="token punctuation">;</span> j<span class="token operator">++</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
    <span class="token keyword">for</span> <span class="token punctuation">(</span><span class="token keyword">var</span> i <span class="token operator">=</span> <span class="token number">1</span><span class="token punctuation">;</span> i <span class="token operator">&lt;=</span> <span class="token number">3</span><span class="token punctuation">;</span> i<span class="token operator">++</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
      star <span class="token operator">+=</span> <span class="token string">'☆'</span>
    <span class="token punctuation">}</span>
    <span class="token comment">// 每次满 5个星星 就 加一次换行</span>
    star <span class="token operator">+=</span> <span class="token string">'\n'</span>
<span class="token punctuation">}</span>
console<span class="token punctuation">.</span><span class="token function">log</span><span class="token punctuation">(</span>star<span class="token punctuation">)</span><span class="token punctuation">;</span>
复制代码
</code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br><span class="line-number">5</span><br><span class="line-number">6</span><br><span class="line-number">7</span><br><span class="line-number">8</span><br><span class="line-number">9</span><br><span class="line-number">10</span><br></div></div><p>核心逻辑：</p> <p>1.内层循环负责一行打印五个星星</p> <p>2.外层循环负责打印五行</p></li> <li><p>for 循环小结</p> <ul><li>for 循环可以重复执行某些相同代码</li> <li>for 循环可以重复执行些许不同的代码，因为我们有计数器</li> <li>for 循环可以重复执行某些操作，比如算术运算符加法操作</li> <li>随着需求增加，双重for循环可以做更多、更好看的效果</li> <li>双重 for 循环，外层循环一次，内层 for 循环全部执行</li> <li>for 循环是循环条件和数字直接相关的循环</li></ul></li></ul> <h3 id="_1-3-while循环"><a href="#_1-3-while循环" class="header-anchor">#</a> 1.3 while循环</h3> <p>while语句的语法结构如下：</p> <div class="language-js line-numbers-mode"><pre class="language-js"><code><span class="token keyword">while</span> <span class="token punctuation">(</span>条件表达式<span class="token punctuation">)</span> <span class="token punctuation">{</span>
    <span class="token comment">// 循环体代码 </span>
<span class="token punctuation">}</span>
复制代码
</code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br></div></div><p>执行思路：</p> <ul><li>1 先执行条件表达式，如果结果为 true，则执行循环体代码；如果为 false，则退出循环，执行后面代码</li> <li>2 执行循环体代码</li> <li>3 循环体代码执行完毕后，程序会继续判断执行条件表达式，如条件仍为true，则会继续执行循环体，直到循环条件为 false 时，整个循环过程才会结束</li></ul> <p>注意：</p> <ul><li>使用 while 循环时一定要注意，它必须要有退出条件，否则会成为死循环</li></ul> <h3 id="_1-4-do-while循环"><a href="#_1-4-do-while循环" class="header-anchor">#</a> 1.4 do-while循环</h3> <p>do... while 语句的语法结构如下：</p> <div class="language-js line-numbers-mode"><pre class="language-js"><code><span class="token keyword">do</span> <span class="token punctuation">{</span>
    <span class="token comment">// 循环体代码 - 条件表达式为 true 时重复执行循环体代码</span>
<span class="token punctuation">}</span> <span class="token keyword">while</span><span class="token punctuation">(</span>条件表达式<span class="token punctuation">)</span><span class="token punctuation">;</span>
复制代码
</code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br></div></div><p>执行思路</p> <ul><li><p>1 先执行一次循环体代码</p></li> <li><p>2 再执行条件表达式，如果结果为 true，则继续执行循环体代码，如果为 false，则退出循环，继续执行后面代码</p> <p>注意：先再执行循环体，再判断，do…while循环语句至少会执行一次循环体代码</p></li></ul> <h3 id="_1-5-continue、break"><a href="#_1-5-continue、break" class="header-anchor">#</a> 1.5 continue、break</h3> <p>continue 关键字用于立即跳出本次循环，继续下一次循环（本次循环体中 continue 之后的代码就会少执行一次）。</p> <p>例如，吃5个包子，第3个有虫子，就扔掉第3个，继续吃第4个第5个包子，其代码实现如下：</p> <div class="language-js line-numbers-mode"><pre class="language-js"><code> <span class="token keyword">for</span> <span class="token punctuation">(</span><span class="token keyword">var</span> i <span class="token operator">=</span> <span class="token number">1</span><span class="token punctuation">;</span> i <span class="token operator">&lt;=</span> <span class="token number">5</span><span class="token punctuation">;</span> i<span class="token operator">++</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
     <span class="token keyword">if</span> <span class="token punctuation">(</span>i <span class="token operator">==</span> <span class="token number">3</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
         console<span class="token punctuation">.</span><span class="token function">log</span><span class="token punctuation">(</span><span class="token string">'这个包子有虫子，扔掉'</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
         <span class="token keyword">continue</span><span class="token punctuation">;</span> <span class="token comment">// 跳出本次循环，跳出的是第3次循环 </span>
      <span class="token punctuation">}</span>
      console<span class="token punctuation">.</span><span class="token function">log</span><span class="token punctuation">(</span><span class="token string">'我正在吃第'</span> <span class="token operator">+</span> i <span class="token operator">+</span> <span class="token string">'个包子呢'</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
 <span class="token punctuation">}</span>
复制代码
</code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br><span class="line-number">5</span><br><span class="line-number">6</span><br><span class="line-number">7</span><br><span class="line-number">8</span><br></div></div><p>运行结果：</p> <p><img src="https://p3-juejin.byteimg.com/tos-cn-i-k3u1fbpfcp/b08029453e8a472cae76a92126e839df~tplv-k3u1fbpfcp-watermark.image" alt="图片1.png"></p> <p>break 关键字用于立即跳出整个循环（循环结束）。</p> <p>例如，吃5个包子，吃到第3个发现里面有半个虫子，其余的不吃了，其代码实现如下：</p> <div class="language-js line-numbers-mode"><pre class="language-js"><code><span class="token keyword">for</span> <span class="token punctuation">(</span><span class="token keyword">var</span> i <span class="token operator">=</span> <span class="token number">1</span><span class="token punctuation">;</span> i <span class="token operator">&lt;=</span> <span class="token number">5</span><span class="token punctuation">;</span> i<span class="token operator">++</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
   <span class="token keyword">if</span> <span class="token punctuation">(</span>i <span class="token operator">==</span> <span class="token number">3</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
       <span class="token keyword">break</span><span class="token punctuation">;</span> <span class="token comment">// 直接退出整个for 循环，跳到整个for下面的语句</span>
   <span class="token punctuation">}</span>
   console<span class="token punctuation">.</span><span class="token function">log</span><span class="token punctuation">(</span><span class="token string">'我正在吃第'</span> <span class="token operator">+</span> i <span class="token operator">+</span> <span class="token string">'个包子呢'</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
 <span class="token punctuation">}</span>
复制代码
</code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br><span class="line-number">5</span><br><span class="line-number">6</span><br><span class="line-number">7</span><br></div></div><p>运行结果：</p> <p><img src="https://p9-juejin.byteimg.com/tos-cn-i-k3u1fbpfcp/a780150b4366463492b32a6267f0c14c~tplv-k3u1fbpfcp-watermark.image" alt="图片2.png"></p> <h2 id="_2-代码规范"><a href="#_2-代码规范" class="header-anchor">#</a> 2 - 代码规范</h2> <h3 id="_2-1-标识符命名规范"><a href="#_2-1-标识符命名规范" class="header-anchor">#</a> 2.1 标识符命名规范</h3> <ul><li>变量、函数的命名必须要有意义</li> <li>变量的名称一般用名词</li> <li>函数的名称一般用动词</li></ul> <h3 id="_2-2-操作符规范"><a href="#_2-2-操作符规范" class="header-anchor">#</a> 2.2 操作符规范</h3> <div class="language-js line-numbers-mode"><pre class="language-js"><code><span class="token comment">// 操作符的左右两侧各保留一个空格</span>
<span class="token keyword">for</span> <span class="token punctuation">(</span><span class="token keyword">var</span> i <span class="token operator">=</span> <span class="token number">1</span><span class="token punctuation">;</span> i <span class="token operator">&lt;=</span> <span class="token number">5</span><span class="token punctuation">;</span> i<span class="token operator">++</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
   <span class="token keyword">if</span> <span class="token punctuation">(</span>i <span class="token operator">==</span> <span class="token number">3</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
       <span class="token keyword">break</span><span class="token punctuation">;</span> <span class="token comment">// 直接退出整个 for 循环，跳到整个for循环下面的语句</span>
   <span class="token punctuation">}</span>
   console<span class="token punctuation">.</span><span class="token function">log</span><span class="token punctuation">(</span><span class="token string">'我正在吃第'</span> <span class="token operator">+</span> i <span class="token operator">+</span> <span class="token string">'个包子呢'</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span>
复制代码
</code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br><span class="line-number">5</span><br><span class="line-number">6</span><br><span class="line-number">7</span><br><span class="line-number">8</span><br></div></div><h3 id="_2-3-单行注释规范"><a href="#_2-3-单行注释规范" class="header-anchor">#</a> 2.3 单行注释规范</h3> <div class="language-js line-numbers-mode"><pre class="language-js"><code><span class="token keyword">for</span> <span class="token punctuation">(</span><span class="token keyword">var</span> i <span class="token operator">=</span> <span class="token number">1</span><span class="token punctuation">;</span> i <span class="token operator">&lt;=</span> <span class="token number">5</span><span class="token punctuation">;</span> i<span class="token operator">++</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
   <span class="token keyword">if</span> <span class="token punctuation">(</span>i <span class="token operator">==</span> <span class="token number">3</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
       <span class="token keyword">break</span><span class="token punctuation">;</span> <span class="token comment">// 单行注释前面注意有个空格</span>
   <span class="token punctuation">}</span>
   console<span class="token punctuation">.</span><span class="token function">log</span><span class="token punctuation">(</span><span class="token string">'我正在吃第'</span> <span class="token operator">+</span> i <span class="token operator">+</span> <span class="token string">'个包子呢'</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span>
复制代码
</code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br><span class="line-number">5</span><br><span class="line-number">6</span><br><span class="line-number">7</span><br></div></div><h3 id="_2-4-其他规范"><a href="#_2-4-其他规范" class="header-anchor">#</a> 2.4 其他规范</h3> <div class="language- line-numbers-mode"><pre class="language-text"><code>关键词、操作符之间后加空格
复制代码
</code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br></div></div><p><img src="https://p3-juejin.byteimg.com/tos-cn-i-k3u1fbpfcp/d68a886a7edf41629a71f23589aeb4ab~tplv-k3u1fbpfcp-watermark.image" alt="图片3.png">  --&gt;</p></div></section> <footer class="page-edit"><!----> <div class="last-updated"><span class="prefix">最后更新时间: </span> <span class="time">2021/9/9 下午3:19:13</span></div></footer> <div class="page-nav"><p class="inner"><span class="prev"><a href="/my-blog/blogs/JavaScript/03.html" class="prev">
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